MT90401 Zarlink Semiconductor, MT90401 Datasheet - Page 2

• Manufacturer Part Number: MT90401
• Description: Sonet/sdh System Synchronizer
• Manufacturer: Zarlink Semiconductor

The MT90401 can operate in free-run, locked or holdover mode. The loop filter corner frequency can be selected to
suit SONET applications or to suit SDH applications. The MT90401 uses an external 20MHz oscillator as its master
clock and it does not require external loop filter components.
In Hardware Mode, the MT90401 can be controlled and monitored via external pins. In Microport Mode, a
microprocessor can be used for more comprehensive control and monitoring.
SECOOR
VDD5
VSS8
RST
HW
R/W
OE
CS
D1
D2
D3
D4
D5
D6
D7
A0
D0
IC
IC
IC
Figure 2 - Pin Connections 80 Pin LQFP for MT90401
62
64
68
70
72
74
76
66
78
80
60
2
58
4
56
6
Zarlink Semiconductor Inc.
54
MT90401AB
8
MT90401
52
10
50
2
12
48
14
46
16
44
18
42
20
40
38
36
34
32
30
28
26
24
22
FS1
FS2
Tdi
Trst
Tclk
Tms
Tdo
VREF
VSS4
C155P
C155N
VDD
VDD2
VSS3
IC
VSS2
PRI
SEC
E3/DS3
E3DS3/OC3
Data Sheet